Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (07): 145-150.doi: 10.13475/j.fzxb.20180503407

• Machinery & Accessories • Previous Articles     Next Articles

Double jacquard control system of warp knitting machine based on dual bus architecture

ZHANG Qi1,2, WEI Li1, LUO Cheng1, XIA Fenglin1, JIANG Gaoming1   

  1. 1. Engineering Research Center for Knitting Technology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu 214122, China
    2. Hubei Digital Textile Equipment Key Laboratory, Wuhan Textile University, Wuhan, Hubei 430077, China
  • Received:2018-05-15 Revised:2019-04-01 Online:2019-07-15 Published:2019-07-25

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Abstract:

In order to solve the problem, too long static data loading time and too slow dynamic data refreshing leading to the inconvenience of pattern change and reduction of speed in the double jacquard warp knitting machine production due to the quick increase in the jacquard comb number and pattern information. A system based on two levels of databus architecture and modular of jacquard control unit of the double jacquard warp knitting jacquard control system was built. 100 Mbps Ethernet was used for big chunks of the pattern file loading, and the double thread scheduling to balance the contradiction between the high-speed flow and low speed storage for the large amount of data was designed. Double data buffer to exchange space for time was adopted to realize the isolation and concurrent execution between the bus data transmission and jacquard action. The conflict between high real-time capability demand and large amount of pattern data transmission effectively was alleviated. By the production verification on the RDJ6/2 double needle warp knitting machine, the designed double jacquard control system can meet the production speed of no lower than 450 r/min, and increases the production speed by nearly 30%. The 1 000-row double-jacquard pattern file loading time is about 10 s, meaning that the loading speed increases by 120 times.

Key words: warp knitting machine, double jacquard control system, production speed, loading speed, double data buffer

CLC Number: 

  • TS183.3

Fig.1

Arrangement of double jacquard bar in RDJ6/2"

Fig.2

Quartic trigger time series of double jacquard"

Fig.3

Load-thread and store-thread of pattern data"

Fig.4

Time series of dynamic data refreshing"

Tab.1

Optimization of double thread task cycle time"

测试
编号		 重复加载
次数		 线程1周期
N值/ms		 线程2周期
M值/ms		 平均加载
时间/s
a 10 2 2 8
b 10 5 2 20
c 10 2 5 10
d 10 5 5 22

Fig.5

Weave sample validation. (a) Drafted pattern; (b) Sample"

Tab.2

System performance comparison between two double jacquard control systems"

双贾卡
系统版本		 总线
类型		 总线速率 1 000横列花型
加载耗时		 同款产品
最高生产速度/
(r·min-1)
V1.0 CAN 250 Kbps 20 min 350
V2.0 Ethernet 100 Mbps 10 s 450
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